1. Department of Astronomy, Tsinghua University , Beijing 100084, China
2. Department of Physics, Chungbuk National University , Cheongju 28644, Republic of Korea
3. Korea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea
4. Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, PL-00-478 Warszawa, Poland
5. Max-Planck-Institute for Astronomy , Königstuhl 17, D-69117 Heidelberg, Germany
6. Department of Astronomy, Ohio State University , 140 W. 18th Ave., Columbus, OH 43210, USA
7. National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, China
8. Department of Physics and Astronomy, University of Canterbury , Private Bag 4800, Christchurch 8020, New Zealand
9. University of Science and Technology, Korea (UST) , 217 Gajeong-ro Yuseong-gu, Daejeon 34113, Republic of Korea
10. Department of Particle Physics and Astrophysics, Weizmann Institute of Science , Rehovot 76100, Israel
11. Center for Astrophysics, Harvard and Smithsonian , 60 Garden St.,Cambridge, MA 02138, USA
12. School of Space Research, Kyung Hee University , Yongin, Kyeonggi 17104, Republic of Korea
13. Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK